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Old 01-21-2015, 11:43 AM   #1
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H2O pressure regulator

Does anyone know if a 1999 36 MDS has a built in water pressure regulator for the city water inlet.I've been using the one that screws on to the inlet before you attach the hose to be sure it doesn't get too much input pressure.

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Old 01-21-2015, 01:18 PM   #2
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My 2000 does not. A pressure regulator must be used. My partner checked the pressure when we arrived at the camp ground in Moab and it was 30 psi. He did not use one, The next morning about 4 AM the pressure went too 100 psi and his water heater blew up.

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Old 01-21-2015, 03:33 PM   #3
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Since the Alpine does not come with a water pressure regulator, I have been using a residential water pressure regulator set at 70 psi for years, and it is permanently installed on the inlet side of my water filters. The residential does cause a restriction like the majority of RV type regulators. This has worked quite well for me, I have no problems no matter where I connect to a water source, and I never worry about high pressure.

Although Alpines equipped with the Reverse Osmosis may have a pressure regulator.

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2001, 38ft FDDS, 350 ISC, Tow 2004 Yukon
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Old 01-21-2015, 04:17 PM   #4
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Alpines with the RO system do not have a built in regulator. I have one that I attach to the hose bib set at 60 # so it protects all the water lines, including the hose to the coach. I have a Glendinning hose reel.

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Old 01-21-2015, 07:17 PM   #5
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I found out I needed one outside Toronto when I came back to a flooded basement. The pressure relief valve in the Hydro Hot opened because the pressure in the campground went to 150! That valve probably saved me damage elsewhere in the coach. 😳😁
Jerry and Judy Davis
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Old 01-21-2015, 07:28 PM   #6
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A restrictor looks like this and provided less water volume 
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A full-flow regulator looks like this

Name:   ImageUploadedByiRV2 - RV Forum1421893600.850810.jpg
Views: 159
Size:  131.9 KB
And, an Oxygenics shower wand provides great showers down to 20 psi.
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Old 01-24-2015, 08:21 PM   #7
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As a rule RV's don't come with a pressure regulator built in (now that could be wrong, but Alpine never installed one). And the job of the regulator is to protect the RV hoses which you use to fill the tank or to have city water. The plumbing in an RV is tested for very high pressure, and depending which type of plumbing you have, Poly or PEX, both can take pressures up to and sometimes over that number. PEX can take good temps as well, especially the red pipe which is designed for hot water systems. Put the regulator on the hose bib, then hook up any filters you use, then attach the hoses which go to the RV, now everything is protected completely. That is what I do, unless I know for sure the pressure is so low in the park, it won't be a problem. With our APEX we have to use the internal pump/tank for all our water needs, and although it's different, we have come to like this system because it keeps the water in the tank fresh and also machinery is supposed to run, so our pump get lots of use. I have changed it three times since we have owned the coach, and I am going to take out the Shur-flo and put in the Aqua-jet one, keeping the SF for a spare. I have heard nothing but good things about the AJ pump.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
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Old 01-24-2015, 09:34 PM   #8
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I have mine plumbed in all the time and set at 45 PSI.
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